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[docs] Note about variables needing to be wrapped in {} #221

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Jan 16, 2020
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[docs] Note about variables needing to be wrapped in {} #221

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4 changes: 3 additions & 1 deletion README.md
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Expand Up @@ -41,7 +41,9 @@ export SECRET_KEY=YOURSECRETKEYGOESHERE

`.env` can interpolate variables using POSIX variable expansion,
variables are replaced from the environment first or from other values
in the `.env` file if the variable is not present in the environment.
in the `.env` file if the variable is not present in the environment.
Ensure that variables are surrounded with `{}` like `${HOME}` as bare
variables such as `$HOME` are not expanded.
(**Note**: Default Value Expansion is not supported as of yet, see
[\#30](https://github.com/theskumar/python-dotenv/pull/30#issuecomment-244036604).)

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